print("hello  world")

print("==========")

print("1")
print("1.2")
print("abc")
print("True")
print("False")
print("None")


print("==========")

print(type(1))
print(type(1.2))
print(type("abc"))
print(type(True))
print(type(False))
print(type(None))

print("==========")

#a = input('请输入一个数字')
#print(a)

print("==========")
print(input('请输入一个数值'))